Interruption
So you've had a major damage to a building owned by your business. Important production has stopped, everything is chaos. The source of income is either gone, because your business is prevented from running operations, or reduced significantly for a period. If you don't have coverage for business interruption or extra expenses due to business interruption, it could mean the end of the road or very unhappy shareholders.
Business interruption coverage covers the difference between expected income in the year of the damage and actual income after the damage.